The load control quality of the primary frequency regulation and AGC in power stations is incompatible with the energy saving requirements of stable low-throttle operation

and normal technology limitations lie in condensate load adjustment and sliding pressure optimization.Against this problem

the energy saving automatic control strategy with deeply pressure sliding based on condensate load adjustment technology was proposed.Condensate load adjustment was used in the technology to improve the unit load response performance to primary frequency and AGC commands

thus to realize the most economical slidingpressure operation.The feasibility and effectiveness verifications of the control strategies were carried out in a 350 MW subcritical generation unit.The results show that deeply sliding-pressure energy-saving automatic control was performed under the premise of performance indicators of grid are achieved.The throttle losses were decreased greatly.The annual average coal consumption of each unit decreased by1.13g/(kW·h).Comsuming the coal price of 600yuan/t

about 622 000 yuan can be saved within a year.Long-standing contradiction has been effectively alleviated between energy-saving operation and grid demands of primary frequency regulation and AGC.